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/*
* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VMWARE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* Measure VBO upload speed.
* That is, measure glBufferDataARB() and glBufferSubDataARB().
*
* Brian Paul
* 16 Sep 2009
*/
#include <string.h>
#include "glmain.h"
#include "common.h"
/* Copy data out of a large array to avoid caching effects:
*/
#define DATA_SIZE (16*1024*1024)
int WinWidth = 100, WinHeight = 100;
static GLuint VBO;
static GLsizei VBOSize = 0;
static GLsizei SubSize = 0;
static GLubyte *VBOData = NULL;
static const GLboolean DrawPoint = GL_TRUE;
static const GLboolean BufferSubDataInHalves = GL_TRUE;
static const GLfloat Vertex0[2] = { 0.0, 0.0 };
/** Called from test harness/main */
void
PerfInit(void)
{
/* setup VBO */
glGenBuffersARB(1, &VBO);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBO);
glVertexPointer(2, GL_FLOAT, sizeof(Vertex0), (void *) 0);
glEnableClientState(GL_VERTEX_ARRAY);
}
static void
UploadVBO(unsigned count)
{
unsigned i;
unsigned total = 0;
unsigned src = 0;
for (i = 0; i < count; i++) {
glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData + src, GL_STREAM_DRAW_ARB);
glDrawArrays(GL_POINTS, 0, 1);
/* Throw in an occasional flush to work around a driver crash:
*/
total += VBOSize;
if (total >= 16*1024*1024) {
glFlush();
total = 0;
}
src += VBOSize;
src %= DATA_SIZE;
}
glFinish();
}
static void
UploadSubVBO(unsigned count)
{
unsigned i;
unsigned src = 0;
for (i = 0; i < count; i++) {
unsigned offset = (i * SubSize) % VBOSize;
glBufferSubDataARB(GL_ARRAY_BUFFER, offset, SubSize, VBOData + src);
if (DrawPoint) {
glDrawArrays(GL_POINTS, offset / sizeof(Vertex0), 1);
}
src += SubSize;
src %= DATA_SIZE;
}
glFinish();
}
/* Do multiple small SubData uploads, then call DrawArrays. This may be a
* fairer comparison to back-to-back BufferData calls:
*/
static void
BatchUploadSubVBO(unsigned count)
{
unsigned i = 0, j;
unsigned period = VBOSize / SubSize;
unsigned src = 0;
while (i < count) {
for (j = 0; j < period && i < count; j++, i++) {
unsigned offset = j * SubSize;
glBufferSubDataARB(GL_ARRAY_BUFFER, offset, SubSize, VBOData + src);
}
glDrawArrays(GL_POINTS, 0, 1);
src += SubSize;
src %= DATA_SIZE;
}
glFinish();
}
static const GLsizei Sizes[] = {
64,
1024,
16*1024,
256*1024,
1024*1024,
16*1024*1024,
0 /* end of list */
};
void
PerfNextRound(void)
{
}
/** Called from test harness/main */
void
PerfDraw(void)
{
double rate, mbPerSec;
int i, sz;
/* Load VBOData buffer with duplicated Vertex0.
*/
VBOData = calloc(DATA_SIZE, 1);
for (i = 0; i < DATA_SIZE / sizeof(Vertex0); i++) {
memcpy(VBOData + i * sizeof(Vertex0),
Vertex0,
sizeof(Vertex0));
}
/* glBufferDataARB()
*/
for (sz = 0; Sizes[sz]; sz++) {
SubSize = VBOSize = Sizes[sz];
rate = PerfMeasureRate(UploadVBO);
mbPerSec = rate * VBOSize / (1024.0 * 1024.0);
perf_printf(" glBufferDataARB(size = %d): %.1f MB/sec\n",
VBOSize, mbPerSec);
}
/* glBufferSubDataARB()
*/
for (sz = 0; Sizes[sz]; sz++) {
SubSize = VBOSize = Sizes[sz];
rate = PerfMeasureRate(UploadSubVBO);
mbPerSec = rate * VBOSize / (1024.0 * 1024.0);
perf_printf(" glBufferSubDataARB(size = %d): %.1f MB/sec\n",
VBOSize, mbPerSec);
}
/* Batch upload
*/
VBOSize = 1024 * 1024;
glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData, GL_STREAM_DRAW_ARB);
for (sz = 0; Sizes[sz] < VBOSize; sz++) {
SubSize = Sizes[sz];
rate = PerfMeasureRate(UploadSubVBO);
mbPerSec = rate * SubSize / (1024.0 * 1024.0);
perf_printf(" glBufferSubDataARB(size = %d, VBOSize = %d): %.1f MB/sec\n",
SubSize, VBOSize, mbPerSec);
}
for (sz = 0; Sizes[sz] < VBOSize; sz++) {
SubSize = Sizes[sz];
rate = PerfMeasureRate(BatchUploadSubVBO);
mbPerSec = rate * SubSize / (1024.0 * 1024.0);
perf_printf(" glBufferSubDataARB(size = %d, VBOSize = %d), batched: %.1f MB/sec\n",
SubSize, VBOSize, mbPerSec);
}
exit(0);
}
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